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Bochner identity : ウィキペディア英語版 | Bochner identity In mathematics — specifically, differential geometry — the Bochner identity is an identity concerning harmonic maps between Riemannian manifolds. The identity is named after the American mathematician Salomon Bochner. ==Statement of the result== Let ''M'' and ''N'' be Riemannian manifolds and let ''u'' : ''M'' → ''N'' be a harmonic map. Let d''u'' denote the derivative (pushforward) of ''u'', ∇ the gradient, Δ the Laplace–Beltrami operator, Riem''N'' the Riemann curvature tensor on ''N'' and Ric''M'' the Ricci curvature tensor on ''M''. Then :
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